Samsung ML-2151N-XBH - Manual (Page 101)

P RINTING T ASKS 5.12
From the software application
1 When you change the print settings from your software
application, access the printer properties. See page 5.2.
2 From the Layout tab, select the paper orientation.
3 From the Duplex(Double-sided Printing) section, select
the desired binding option.
4 Click the Paper tab and select the paper source, size and
type.
5 Click OK and print the document.
The printer prints on both sides of paper.
N OTE : The setting in the software application overrides that on
the control panel.